Yellowish-green pigment dyes and process of making same.



UNITED s'rArras PATENT cl rion.

' AUGUST STOCK, OF HtjGHST-ON-Tl-IE-MAIN, GERMANY, ASSIGNOB TO FARBWERKE V031. MEIS'IER LUCIUS & BR'UNING, F HGGHST-ON-THE-MAIN, GERMANY, A COR- PORATION.

' YELLOWISH-GREEN PIGMENT DYES AND PROCESS OF MAKING SAME.

No Drawing.

Serial No. 596,320.

; chemist, a citizen of the Empire of Germany, residing at Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in Yellowish Green Pigment Dyes and Processes of Making Same, of which the following is a specification.

For the preparation of pigment dyestuffs there are extensively used'the tetramethyland tetraethyl diamino triphenylmethane 'dyes respectively which are commercially known by the names of malachite-green and brilliant-green. Now, as the most yellowish of these dyestuffs, namely brilliant-green, dyes tints of a rather blue hue, there has been hitherto a decided want of a dyestuif suitable for the production of the preferred yellower'tints; and the attempt was made to obtain such tints by mixing the above said dyestuffs, with yellow dyes,'particularly with aurainin. Now, I have found that the de rivatives of the said dyestuffs obtainable from para-chlorobenzaldehyde are eminently suitable for supplying thesaid want. The color-lakes obtained therefrom are of such a pure tint that the aforesaid mixtures of brilliant-green and auramin are far from being able to compete with these lakes;

moreover the dyestuffs offer all advantages possessed by a homogeneous product over a dyestuff mixture.

The preparation of the color-lakes from the dyestuffs is made by causing the dye solution ,to act upon a suspension of green- 'of the dyestufi' with able for their extraordinary fastness to light and lime and their insolubility in water, The dyestuffs may also be precipitated by other precipitating agents, such as tannin,-

earth, 2'. e. a naturally-occurring magnesiumiron-aluminium-calcium-silicate, while well stirring, whereby insoluble yellowish-green lakes are precipitated which are compounds reen earth, remarksoaps, solutions ofresin, potassium silicate or the like.

Having now described my invention, .what I claim is: I

1. The herein-described process of preparing yellowish-green color-lakes, which consists in precipitating the tetraalkyldiaminop-chlorotriphenyl-methane dyestufi's, substantially as described. Y

2. As new products, the herein-described color-lakes, being compounds of the tetraalkyldiaminosp-chlorotriphenylmethane dyestuffs with precipitants, and being green powders of a bright tint, fast to water.

3. As a new product, the herein-described color-lake, being a green-earth compound of the tetraethyldiamino-p-chlorotriphenylniethanedyestuifs, andbeing a green powder of a bright tint, fast to water, lime and light.

In testimony whereof, I aflix my signa-- JEAN GRUND, CARL GRUND.

Copies of this patent may he obtained for five cents each, by addressing the Commissioner of Patents,

, Washington, I). G.

Specification of Letters Patent. I Patented Nov. 5, i912- Application filed neeemner 8, 1910. 

